If you throw a grenade right before the moment of death, and it doesn't do any damage to your opponent, it won't be spent and remain in your inventory. Only the animation is played at that moment, while the grenade itself isn't used at all.
The reason for this situation is that our server receives information about the death of your game character before he throws the grenade. The player marked by the server as deceased can no longer damage other players or spend any items.
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